Re: [Xen-devel] [PATCH 5/5] IOMMU: iommu_snoop is x86/HVM-only

[Jan Beulich <jbeulich@xxxxxxxx>]

On 28.02.2020 21:20, Andrew Cooper wrote:
> On 28/02/2020 12:27, Jan Beulich wrote:
>> In fact it's VT-d specific, but we don't have a way yet to build code
>> for just one vendor. Provide a #define for all other cases.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> 
> iommu_snoop has no specific interaction with HVM.
> 
> It is for any cacheability games the hypervisor may play on a VM, and
> that in principle includes PV guests as well.

Oh, in the grep results I overlooked

    /* Set the SNP on leaf page table if Snoop Control available */
    if ( iommu_snoop )
        dma_set_pte_snp(new);

Thanks for pointing out, will correct.

Jan

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